Manuel Rivera, 18, was in the Robert N. Davoren Center when he was attacked around 10:05 a.m., officials said. The person who attacked him will be re-arrested and charged for the slashing.

“We are moving aggressively to stop gang activity, and the upcoming installation of high-tech body scanners will help catch the kind of weapon that inmates often use in attacks like this,” Department of Correction Deputy Commissioner for Public Information Peter Thorne said. “There were no faulty cell doors involved in this incident.”